var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var ejs = require('ejs');
var route = require('./routes/index');
var log4js = require('log4js');
var models = require("./models/index");
var app = express();

//初始化工作
init();
// view engine setup
app.set('views', path.join(__dirname, 'views'));
// app.set('view engine', 'jade');

app.engine('.html', ejs.__express);
app.set('view engine', 'html');

// uncomment after placing your favicon in /public
//app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
// app.use(logger('dev'));

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
app.use(function (req, res, next) {
      models(function (err, db) {
        if (err) return next(err);

        req.models = db.models;
        req.db     = db;
        return next();
      });
});


//初始化路由
route(app);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  var err = new Error('Not Found');
  err.status = 404;
  next(err);
});

// error handlers

// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
  app.use(function(err, req, res, next) {
    res.status(err.status || 500);
    res.render('error', {
      message: err.message,
      error: err
    });
  });
}

// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
  res.status(err.status || 500);
  res.render('error', {
    message: err.message,
    error: {}
  });
});

function init(){
  //初始化log4j配置
  log4js.configure('./config/log4js.json');

  //监控全局异常，防止系统被终止
  process.on('uncaughtException', function (err) { 
    console.error('未捕捉的异常: ' + err.stack); 
  }); 
}


module.exports = app;
